The Mark of Excellence program (U.S.) (Fig. 23) recognizes the achievements, professionalism, and commitment of many members of the GM dealership community. For 2021, service technicians enrolled in the program […]
When 2018-2021 GM models equipped with an Infotainment 3 System (RPO IOR, IOS, IOT, IOU, IOV) (Fig. 26) come into the dealership with various system concerns – the radio display […]
A number of fuel-related DTCs may be set on some 2017-2018 Silverado, Sierra; 2019-2021 Silverado 2500HD/3500HD, Sierra 2500HD/3500HD, and Silverado 4500HD/5500HD/6500HD models equipped with the 6.6L Duramax diesel engine (RPO […]
Some 2021 Tahoe, Suburban, Yukon and Escalade models may have a Service Theft Deterrent message on the instrument cluster and several DTCs set, including: B113C (Security Indicator Control), B13AC (Lane […]
The EL-52545 TPMS and RF tool offers the ability to quickly identify a key fob (Fig. 1), making it easy to match the fob with a vehicle in the dealership’s […]
The Field Service Engineer (FSE) Technician Recognition Awards (U.S.), a new recognition program that celebrates the skill and dedication of dealership technicians who have recently worked with FSE’s on challenging […]
The 3.0L Duramax diesel engine (RPO LM2) on some 2020-2021 Silverado and Sierra models and 2021 Tahoe, Suburban, Yukon and Escalade models may have possible terminal corrosion in the coolant […]
A fuel odor from the engine compartment may be found on some 2020-2021 Encore GX and 2021 Trailblazer models equipped with the 1.3L engine (RPO L3T). Perform an inspection of […]
When replacing the hood latch (Fig. 16) on 2016-2018 Camaros, the service replacement hood latch will require the use of a new connector. The new service latch has a three-wire […]
When changing tire and wheel sizes on 2003-2021 GM models, a new tire calibration will be needed. GM offers tire calibrations for tires that have been sized, tested and designed […]
The monthly GM Service Know-How Emerging Issues seminars provide service/technical information on current issues and GM certified repairs. The latest service topics from GM Brand Quality and Engineering covered in […]
When testing or charging a 12V battery in a vehicle that is in for service or is part of the dealership’s inventory, the EL-50313 Midtronics GR8 Battery Tester/Charger or EL-52800 […]
A new Original Equipment (OE) Battery Ratings chart is now available for use when testing batteries using the EL-50313 GR8 Battery Tester/Charger and EL-52800 Diagnostic Charge Battery Station (DCBS). The […]
Techline Connect is quickly becoming the source for all diagnostic applications in the dealership service department. As part of the transition to Techline Connect, GDS2 is now being removed from […]
Check 55-Way Connector if Glow Plug DTCs are Set
Setting Up Wired and Wireless MDI 2 Connections
MDI 2 Advanced Setup Technical Tips Update
April Service Newsletter from the Experts at GM TAC
Proper Use and Diagnostic Tips for NFC Key Cards
Camshaft Position Sensor Performance Diagnosis
Tick Sound at Idle on V8 Engines
March Service Newsletter from the Experts at GM TAC
CCND Labor Codes Updated for Infotainment Audio and Screen Conditions
FSE Technician Recognition Awards – 1st Quarter 2026
Radiator Inlet Hose Coolant Leak
Sending GDS 2 Session Logs to TAC Using CX Connect
Key Fob Synchronization Update
CT5-V Blackwing Precision Package Features High-Performance Cup Tires with Unique AppearanceDCA-8000
Troubleshooting
Guide
TAC Newsletter April 2026
TAC Newsletter March 2026
Techline Connect Tips November 2024
CX Connect Case Creation Help + Tips and Tricks
Safety Arc-Rated (AR) Personal Protection Equipment (PPE) is recommended to be used by technicians when servicing some high-voltage battery packs under certain scenarios on GM electric vehicles. The PPE that […]
The latest update to the MDI 2 Manager in Techline Connect (version 9.1.2752.177) includes support for new MDI 2 wireless dongles. The new wireless dongles are similar to the previously […]
Take a detailed look at a wide range of innovative features and advanced systems found on GM vehicles to gain a better understanding of proper operation. Each short video reviews how a feature works, highlights operating tips and shows ways to customize settings, if applicable.
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